CLAIRTON, Pa. - Five days a week, Linda Graham trolls tattered neighborhoods of this once thriving steel city outside Pittsburgh for unregistered voters she can sign up as Democrats — one of thousands of unknown volunteers whose work outside the limelight has already altered the basic arithmetic of the November election.

The epic nomination battle between Barack Obama and Hillary Rodham Clinton helped put millions more Democrats on the voter rolls while Republican registration declined. Now Graham, 45, has taken three months of unpaid leave from her job at Pittsburgh's Central Blood Bank in the hope of adding to those gains before the presidential vote.

She's encouraged by the response here. "They're all feeling the crunch" of lost jobs and a sagging economy, Graham said. "But people are feeling empowered. They're feeling like, you know what, I hold a little bit of power in this."

To counter this effort, the Republicans are counting on a formidable, high-tech get-out-the-vote operation that has helped them win the past two presidential elections.

Since the last federal election in 2006, volunteers like Graham combined with the enthusiasm generated by the Obama-Clinton struggle to add more than 2 million Democrats to voter rolls in the 28 states that register voters according to party affiliation. The Republicans have lost nearly 344,000 thousand voters in the same states.

The Democrats hope their voter registration efforts can boost Obama to victory in competitive states like Pennsylvania, Nevada and Florida and perhaps even give him a shot at winning traditional Republican states like Georgia, North Carolina and Virginia.

Both Obama and his Republican rival, John McCain, are fighting for independent swing voters, and many of the new Democrats had been unaffiliated voters.

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"Behind every great fortune lies a great crime."Honore de Balzac

"Democrats work to help people who need help. That other party, they work for people who don't need help. That's all there is to it."~Harry S. Truman